mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
08e696c0b2
patch by Martin Storsjö (martin AT martin DOT st) Originally committed as revision 18375 to svn://svn.ffmpeg.org/ffmpeg/trunk
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/*
|
|
* RTP packetization for AMR audio
|
|
* Copyright (c) 2007 Luca Abeni
|
|
* Copyright (c) 2009 Martin Storsjo
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "rtpenc.h"
|
|
|
|
/**
|
|
* Packetize AMR frames into RTP packets according to RFC 3267,
|
|
* in octet-aligned mode.
|
|
*/
|
|
void ff_rtp_send_amr(AVFormatContext *s1, const uint8_t *buff, int size)
|
|
{
|
|
RTPMuxContext *s = s1->priv_data;
|
|
int max_header_toc_size = 1 + s->max_frames_per_packet;
|
|
uint8_t *p;
|
|
int len;
|
|
|
|
/* Test if the packet must be sent. */
|
|
len = s->buf_ptr - s->buf;
|
|
if (s->num_frames == s->max_frames_per_packet || (len && len + size - 1 > s->max_payload_size)) {
|
|
int header_size = s->num_frames + 1;
|
|
p = s->buf + max_header_toc_size - header_size;
|
|
if (p != s->buf)
|
|
memmove(p, s->buf, header_size);
|
|
|
|
ff_rtp_send_data(s1, p, s->buf_ptr - p, 1);
|
|
|
|
s->num_frames = 0;
|
|
}
|
|
|
|
if (!s->num_frames) {
|
|
s->buf[0] = 0xf0;
|
|
s->buf_ptr = s->buf + max_header_toc_size;
|
|
s->timestamp = s->cur_timestamp;
|
|
} else {
|
|
/* Mark the previous TOC entry as having more entries following. */
|
|
s->buf[1 + s->num_frames - 1] |= 0x80;
|
|
}
|
|
|
|
/* Copy the frame type and quality bits. */
|
|
s->buf[1 + s->num_frames++] = buff[0] & 0x7C;
|
|
buff++;
|
|
size--;
|
|
memcpy(s->buf_ptr, buff, size);
|
|
s->buf_ptr += size;
|
|
}
|
|
|